Hello, I have a 1998 V70 GLT 2.4 auto. Nice little puddle of motor oil coming from drivers side. Noticed a small black plug on the engine block, looks like leak coming from this. The plug faces the firewall, and can be seen between between a few turbo inlet hoses. This plug moves freely around. Any idea what this part is called? Cant seem to find anything like this. I will be doing the PVC system soon and would like to fix at same time.
Thanks very much for any help finding this part.

 

I've read that there is a manufacturing plug back there and that there is a perfected part available at dealers.
The posts I read involved failures of the less-that-perfect one.
I don't recall if a proper name was ever cited.